Power system and method
a power system and power technology, applied in the field of power systems, can solve the problems of compromising the reliability increasing the cost and footprint of the power system,
Active Publication Date: 2020-05-26
GE GLOBAL SOURCING LLC
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- Summary
- Abstract
- Description
- Claims
- Application Information
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Benefits of technology
This patent describes a power system that includes two converters and control units. The second converter measures the phase currents and determines a harmonic current transmitted by the second converter. The second control unit then changes the time-period of the carrier wave of the second converter to synchronize with the carrier wave of the first converter. This results in a more efficient power system and better synchronization between the converters.
Problems solved by technology
The use of the current limiting reactors, however, can increase the cost and footprint of the power system.
The use of the high speed communication network can compromise the reliability of the power system.
Method used
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[0012]Unless defined otherwise, technical and scientific terms used herein have the same meaning as is commonly understood by one of ordinary skill in the art to which this specification belongs. The terms “first”, “second”, and the like, as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the terms “a” and “an” do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced items. The use of “including,”“comprising” or “having” and variations thereof herein are meant to encompass the items listed thereafter and equivalents thereof as well as additional items. The terms “connected” and “coupled” are not restricted to physical or mechanical connections or couplings, and can include electrical connections or couplings, whether direct or indirect. Furthermore, terms “circuit” and “circuitry” and “controlling unit” may include either a single component or a plurality ...
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A power system is presented. The power system includes a first converter including a first output terminal a first control unit coupled to the first converter, a second converter including a second output terminal, where the second converter is coupled in parallel to the first converter, and a second control unit coupled to the second converter. The second control unit is configured to measure a plurality of phase currents at the second output terminal, determine a harmonic current transmitted by the second converter based on single phase current of the plurality of measured phase currents, and change a time-period of at least one switching cycle of a carrier wave of the second converter based on the determined harmonic current to synchronize with a carrier wave of the first converter.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a continuation-in-part of U.S. patent application Ser. No. 15 / 675,845, which was filed on 14 Aug. 2017, and the entire disclosure of which is incorporated herein by reference.BACKGROUND[0002]Embodiments of the inventive subject matter generally relate to power systems and more specifically to a power system and a method for reducing a high frequency circulating harmonic current flowing between a plurality of converters of the power system.[0003]Power systems, such as solar based power systems, wind based power systems, and the like, can include a plurality of converters connected in parallel to each other. The power system typically includes inductors and capacitors coupled to the converters. High frequency circulating harmonic current can flow between the converters due to a low value of impedance of a resonant path that is formed by the capacitors and inductors. Stress on power semiconductor devices in the converters ...
Claims
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IPC IPC(8): H02M1/12H02M7/493H02M1/00
CPCH02M1/126H02M7/493H02M2001/0009Y02B70/10H02M1/0048H02M1/0009
Inventor ALI, SHAHIDKUMAR, AJITH KUTTANNAIRGANIREDDY, GOVARDHANCHENNAMSETTY, PRASHANTH MANIKUMAR
Owner GE GLOBAL SOURCING LLC